package string;
/** StringBuilder的演示 */
public class StringBuilderDemo {
    public static void main(String[] args) {

        String str="好好学习Java";
        StringBuilder builder=new StringBuilder(str);

        //append():追加内容---在末尾追加
        builder.append(",为了找个好工作.");
        System.out.println(builder);

        //replace():替换部分内容(含头不含尾)
        builder.replace(9,16,"就是为了改变世界");
        System.out.println(builder);

        //delete():删除部分内容（含头不含尾）
        builder.delete(0,8);
        System.out.println(builder);

        //insert()：插入内容
        builder.insert(0,"活着");
        System.out.println(builder);


        /*
        //StringBuilder的创建方式
        StringBuilder builder1=new StringBuilder();
        StringBuilder builder2=new StringBuilder("abc");

        //String和StringBuilder互转
        String str="abc";
        StringBuilder builder3=new StringBuilder(str);
        String str2=builder3.toString();

         */


    }
}
